CN111219207A

CN111219207A - Fully mechanized mining face pressure step distance automatic measuring method and electronic equipment

Info

Publication number: CN111219207A
Application number: CN202010001083.1A
Authority: CN
Inventors: 蒙昱璋; 崔亚仲; 周海丰; 张鹏; 王占飞; 魏文刚; 关丙火; 谢巧军
Original assignee: Shenhua Shendong Coal Group Co Ltd
Current assignee: Guoneng Ordos Engineering Design Co ltd
Priority date: 2020-01-02
Filing date: 2020-01-02
Publication date: 2020-06-02
Anticipated expiration: 2040-01-02
Also published as: CN111219207B

Abstract

The invention discloses a method for automatically measuring the pressure step distance of a fully mechanized mining face and electronic equipment, wherein the method comprises the following steps: collecting working face support pressure time sequence change data and coal mining machine displacement time sequence change data; finding out a plurality of continuous increasing sequences and continuous decreasing sequences from the displacement change data of the coal mining machine, and taking the effective continuous increasing sequences and the effective continuous decreasing sequences as coal cutting circulating sequences; calculating the maximum working resistance of the coal cutter passing through the hydraulic support in each coal cutting cycle sequence to form a pressure matrix of the whole working surface, wherein the pressure matrix comprises the maximum working resistance of each coal cutting cycle sequence on each hydraulic support; and calculating the pressure step pitch of the whole working surface according to the pressure matrix. The invention does not need manual participation, can realize the step length by the automatic calculation of the computer through the automatic data acquisition and the automatic program operation, has higher analysis efficiency and analysis accuracy of the mine pressure data, and greatly reduces the production cost of coal mine enterprises.

Description

Fully mechanized mining face pressure step distance automatic measuring method and electronic equipment

Technical Field

The invention relates to the related technical field of coal mines, in particular to a method for automatically measuring the pressure step distance of a fully mechanized face and electronic equipment.

Background

Roof disasters are one of five disasters of coal mines, due to the characteristics of multiple points, wide range, high control difficulty and the like, the roof disasters always stay in the front in various coal mine accidents, the strengthening of mine pressure monitoring and early warning are effective means for preventing and treating the roof disasters, the calculation of the pressure step pitch of a fully mechanized mining face is an essential link in roof management, the existing pressure step pitch calculation is manually observed, recorded and periodically statistically analyzed, but the method is time-consuming and labor-consuming, has poor timeliness and cannot guarantee accuracy.

In recent years, due to the rapid development of sensors and modern electronic technology, various parameters of the underground working environment are acquired in real time, the data acquisition period reaches the second level, but due to factors such as the complexity of underground stope conditions and unstable data quality, the accuracy and the analysis efficiency of mine pressure data analysis are low, the data cannot truly reflect the real-time safety condition of a roof, and measures cannot be purposefully taken to prevent the mine pressure hazard.

In the method for calculating the pressure step distance in China at present, a manual recording method is mainly adopted, pressure sensors are arranged on a left upright post and a right upright post of a hydraulic support, pressure values can be dynamically displayed on a centralized control platform, when a coal mining machine passes through the pressure sensors before cutting coal, a technician records readings into an Excel table, corresponding working face footage data needs to be manually recorded by the technician when the coal mining machine cuts the coal, a curved surface chart is periodically manufactured, then the distance between two high-pressure areas is manually measured, and the pressure step distance of the working face is calculated through weighted average.

At present, no mature, reliable and accurate automatic calculation method for the step pressure of the fully mechanized mining face exists.

Disclosure of Invention

Therefore, it is necessary to provide an automatic measuring method and electronic equipment for the fully mechanized face pressure step distance, aiming at the technical problem that the prior art does not have a mature, reliable and accurate automatic calculation method for the fully mechanized face pressure step distance.

The invention provides a method for automatically measuring the pressure step distance of a fully mechanized mining face, which comprises the following steps:

collecting working face support pressure time sequence change data and coal mining machine displacement time sequence change data, wherein the support pressure time sequence change data comprise pressure data corresponding to time of each hydraulic support, and the coal mining machine displacement time sequence change data comprise the number of hydraulic support supports passed by a coal mining machine at different time;

finding out a plurality of continuous increasing sequences and continuous decreasing sequences from the displacement change data of the coal mining machine, and taking the effective continuous increasing sequences and the effective continuous decreasing sequences as coal cutting circulating sequences;

calculating the maximum working resistance of the coal cutter passing through the hydraulic support in each coal cutting cycle sequence to form a pressure matrix of the whole working surface, wherein the pressure matrix comprises the maximum working resistance of each coal cutting cycle sequence on each hydraulic support;

and calculating the pressure step pitch of the whole working surface according to the pressure matrix.

Further, the finding out a plurality of continuous increasing sequences and continuous decreasing sequences from the displacement change data of the coal mining machine, and taking the effective continuous increasing sequences and the effective continuous decreasing sequences as coal cutting cycle sequences specifically includes:

sequentially searching a plurality of continuous increasing sequences and continuous decreasing sequences in the displacement change data of the coal mining machine to be used as coal cutting circulation sequences to be selected;

select to satisfy

The coal cutting cycle sequence to be selected is taken as a coal cutting cycle sequence, wherein A is a minimum position change speed constant, B is a maximum position change speed constant,c is the shortest displacement distance, D is the minimum sequence number, a₁The support number, a, of the displacement variation data of the first shearer in the cyclic sequence of the coal to be selected_nThe support number t of the displacement change data of the last coal mining machine in the circular sequence of the coal to be selected₁The time, t, of the displacement variation data of the first shearer in the cyclic sequence of the coal to be selected_nThe Count is the time of the displacement change data of the last coal mining machine in the coal cutting cycle sequence to be selected.

Further, the sequentially searching a plurality of continuous increasing sequences and continuous decreasing sequences in the displacement change data of the coal mining machine as the coal cutting cycle sequence to be selected specifically comprises:

the following method is adopted to search the continuous increasing sequence:

bracket number a for sequentially comparing displacement time sequence change data of two adjacent coal mining machines_n-1And a_nIf the bracket number a of the displacement time sequence change data of the previous coal mining machine_n-1<Bracket number a of current coal mining machine displacement time sequence change data_nAdding the displacement time sequence change data of the current coal mining machine into the continuous increasing sequence;

when a is_n-1≥a′_nIn time, K1 coal mining machine displacement time sequence change data are searched backwards, if a exists_n-1<Support number a of displacement time sequence change data of mth coal mining machine_mAdding the displacement time sequence change data of the mth coal mining machine into the continuous increasing sequence, continuously searching backwards by taking the displacement time sequence change data of the mth coal mining machine as a searching base point, and otherwise, ending the searching, wherein K1 is a preset constant;

the continuously decreasing sequence is searched in the following way:

bracket number a for sequentially comparing displacement time sequence change data of two adjacent coal mining machines_n-1' and a_n', if the previous shearer shifts the bracket number a of the time series change data_n-1'>Bracket number a of current coal mining machine displacement time sequence change data_nAdding the displacement time sequence change data of the current coal mining machine into the continuous decreasing sequence;

when a is_n-1'≤a_n' at this time, K2 scaffolds were searched backwards, if a existed_n-1'Mth' support number a of coal mining machine displacement time sequence change data_mAdding the displacement time sequence change data of the mth coal mining machine into the continuous decreasing sequence, and continuously searching backwards by taking the displacement time sequence change data of the mth coal mining machine as a searching base point, otherwise, ending the searching, wherein K2 is a preset constant.

Further, the maximum working resistance of the coal mining machine passing through the hydraulic support is calculated in each coal cutting cycle sequence to form a pressure matrix of the whole working surface, wherein the pressure matrix comprises the maximum working resistance of each coal cutting cycle sequence at each hydraulic support, and the method specifically comprises the following steps:

calculating the maximum working resistance of the coal mining machine when the coal mining machine passes through the hydraulic support in each coal cutting cycle sequence to form a pressure matrix of the whole working surface

Wherein F_cdThe pressure value of the maximum working resistance of the coal mining machine passing through the d-th hydraulic support in the c-th coal cutting cycle sequence is obtained.

Further, the calculating the pressure step of the whole working surface according to the pressure matrix specifically includes:

slicing the pressure matrix to obtain a plurality of sub-pressure matrixes;

for each sub-pressure matrix, converting the sub-pressure matrix into a corresponding incoming pressure identification matrix P according to the comparison of each pressure value with the pressure threshold value:

wherein p is_ijIs the pressure value F of the maximum working resistance of the jth hydraulic support in the ith coal cutting cycle sequence_ijComparison with a pressure threshold, if F_ijF1 threshold, p_ijIf F is 1_ij<F1 threshold, then p_qt＝0；

Calculating an incoming pressure intensity matrix of the incoming pressure identification matrix P

Wherein

According to p_ijOf the neighbor matrix

Calculated to obtain when p_i-1j-1+p_i-1j+p_i-1j+1+p_ij-1+p_ij+p_ij+1+p_i+1j-1+p_i+1j+p_i+1j+1When not less than N1, let

When p is_i-1j-1+p_i-1j+p_i-1j+1+p_ij-1+p_ij+p_ij+1+p_i+1j-1+p_i+1j+p_i+1j+1If < N2, let

Wherein N1 and N2 are preset constants;

calculating the pressure vector according to the pressure matrix, and converting the pressure matrix into the pressure column vector

Converting the pressure intensity column vector into a coming pressure intensity characteristic character string sequence through numerical value splicing, matching the coming pressure intensity characteristic character string sequence to obtain a plurality of coming pressure continuous segments and non-coming pressure continuous segments, calculating the coming pressure continuous distance by taking the numerical value included by each coming pressure continuous segment as the number of coal cutting knives of coming pressure for one time, calculating the number of the non-coming pressure continuous segments between the coming pressure continuous segment corresponding to the coming pressure continuous distance and the coming pressure continuous segment corresponding to the next coming pressure continuous distance as the number of the coal cutting knives of coming pressure ending to next coming pressure starting, calculating the distance from the coming pressure ending to next coming pressure starting based on the number of the coal cutting knives of coming pressure ending to next coming pressure starting, and adding the coming pressure continuous distance to the distance from the coming pressure ending to next coming pressure starting as the coming pressure step distance;

and for each sub-pressure matrix, obtaining the number of the pressure-coming steps and the average pressure-coming step of the sub-pressure matrix, and obtaining the pressure-coming step of the whole working surface through weighting calculation according to the number of the pressure-coming steps and the average pressure-coming step of the plurality of sub-pressure matrices.

The invention provides an electronic device for automatically measuring the step pitch of the pressure of a fully mechanized mining face, which comprises:

at least one processor; and the number of the first and second groups,

a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor to enable the at least one processor to:

select to satisfy

The coal-cutting cycle sequence to be selected is taken as a coal-cutting cycle sequence, wherein A is a minimum position change speed constant, B is a maximum position change speed constant, C is a shortest displacement distance, D is the minimum sequence number, a₁The support number, a, of the displacement variation data of the first shearer in the cyclic sequence of the coal to be selected_nThe support number t of the displacement change data of the last coal mining machine in the circular sequence of the coal to be selected₁The time, t, of the displacement variation data of the first shearer in the cyclic sequence of the coal to be selected_nThe Count is the time of the displacement change data of the last coal mining machine in the coal cutting cycle sequence to be selected.

the following method is adopted to search the continuous increasing sequence:

the continuously decreasing sequence is searched in the following way:

slicing the pressure matrix to obtain a plurality of sub-pressure matrixes;

Wherein

According to p_ijOf the neighbor matrix

Wherein N1 and N2 are preset constants;

The invention provides an automatic calculating method of the fully mechanized face pressure step pitch based on the position of a coal machine and the mine pressure change characteristic, in particular to an automatic calculating method of the fully mechanized face pressure step pitch of 8.8 meters, which does not need manual participation, can realize automatic identification of coal cutting behaviors, acquisition of maximum working resistance and calculation of the mine pressure step pitch by a computer through automatic data acquisition and automatic program operation, has higher analysis efficiency and analysis accuracy of mine pressure data, and greatly reduces the production cost of coal mine enterprises.

Drawings

FIG. 1 is a working flow of an automatic measuring method for the pressure step distance of a fully mechanized mining face according to the present invention;

FIG. 2 is a schematic diagram of a hardware structure of an electronic device for automatically measuring a step pressure from a fully mechanized mining face according to the present invention;

FIG. 3 is a curved view of mine pressure monitoring according to the preferred embodiment of the present invention;

FIG. 4 is a bi-coordinate pressure monitoring surface diagram of the preferred embodiment of the present invention;

FIG. 5 is a graph of historical analysis of the pace of the previous steps according to the preferred embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples.

Fig. 1 shows a flow chart of the automatic measuring method for the pressure step distance of the fully mechanized mining face, which comprises the following steps:

step S101, collecting working face support pressure time sequence change data and coal mining machine displacement time sequence change data, wherein the support pressure time sequence change data comprise pressure data corresponding to time of each hydraulic support, and the coal mining machine displacement time sequence change data comprise the number of hydraulic support supports passed by a coal mining machine at different time;

s102, finding out a plurality of continuous increasing sequences and continuous decreasing sequences from the displacement change data of the coal mining machine, and taking the effective continuous increasing sequences and the effective continuous decreasing sequences as coal cutting circulating sequences;

step S103, calculating the maximum working resistance of the coal cutter passing through the hydraulic support in each coal cutting cycle sequence to form a pressure matrix of the whole working surface, wherein the pressure matrix comprises the maximum working resistance of each coal cutting cycle sequence on each hydraulic support;

and step S104, calculating the pressure step pitch of the whole working surface according to the pressure matrix.

At present, the length of a fully mechanized mining face in China is about 300m generally, and the number of hydraulic supports is about 150. Although the mining pressure monitoring data is complicated and changeable by geological conditions and mining conditions, the data sources which can be collected are limited, and the time-based mine pressure monitoring data cannot be directly related to the working face propulsion degree. But even so, the coal machine displacement is regularly cyclable during each coal mining cycle. Firstly, analyzing a coal cutting curve of a coal cutter, removing invalid data, establishing an analysis model for identifying the number of effective coal cutting knives counted by a coal cutting row, and accumulating the footage of a working face according to 0.8-0.865 m/knife so as to obtain the corresponding relation between the working face time and the footage. And secondly, periodically acquiring the maximum working resistance of each hydraulic support in the coal mining stage, and determining the maximum working resistance as a pressure value under the current footage. Then, dividing the pressure value, considering that the top plate is pressed and correspondingly marked when the pressure value is higher than 350bar, establishing a working surface pressing step statistical analysis model according to the distribution characteristics of the marked points, judging that the pressure is pressed when the pressure characteristic value of the adjacent area reaches a set condition, and calculating the present pressing continuation distance and the pressing step distance when the next pressure is reached.

Therefore, the coal machine position and the mine pressure change characteristics are analyzed, effective data are collected, a data analysis model is established, and the pressure step pitch of the fully mechanized coal face can be automatically calculated.

Specifically, step S101 first collects working face support pressure data and time sequence change data of coal mining machine displacement, and performs constrained division on the data, thereby facilitating statistical analysis and visual display.

The preferred steps are as follows:

① selects 1#, 4#, 7#, … … 133#, 136#, … …, (3 x N-2) bracket right pressure and coal cutter position as research objects in the working face, and data are collected every 30 s.

② pressure below 250bar considers safe mine pressure as a classification, each 50bar increase is a classification and assigned a color, the darker the color represents the higher the roof pressure, which is beneficial for visualization, 350bar is used as a pressure threshold, and the pressure above 350bar considers the roof pressure to be used for the pressure step calculation.

Then, step S102 determines a coal cutting cycle sequence. The accumulated footage automatically corresponds to time, pressure data of the hydraulic support comes from a sensor and only corresponds to the time, invalid data are removed through coal cutting curve analysis of the coal mining machine, coal cutting behaviors are identified, the number of effective coal cutting knives is counted, the footage of the working face is dynamically accumulated according to 0.8-0.865 m/knife, and therefore the corresponding relation between the working face time and the footage is obtained.

Step S103, collecting the maximum cycle end resistance of the hydraulic support, and finally forming a pressure matrix. Specifically, in the process of cutting coal by the coal mining machine through the hydraulic support, the pressure of the top plate acting on the support is gradually increased from a stable state after the initial supporting force until the coal mining machine is pushed forwards away from the support, and the maximum supporting force of the support when the support bears the pressure of the top plate in the process is called as the working resistance of the support. Using formula F in each coal cutting cycle sequence_max＝max{F(t,t_{Coal machine entry}＜t＜t_{Coal mill exit}) And (4) calculating the maximum working resistance of the coal mining machine when the coal mining machine passes through the hydraulic support, and finally forming a pressure matrix.

Step S104 presses the step pitch based on the pressure matrix calculation. Finally, early warning analysis can be carried out based on the coming pressure step pitch, and the early warning analysis method can adopt the existing early warning analysis technology based on the coming pressure step pitch.

The coal mining machine can be an ultra-large mining height coal mining machine with the average mining height of a working face more than 8.8 meters.

In one embodiment, the finding out a plurality of continuous increasing sequences and continuous decreasing sequences from the displacement change data of the coal mining machine, and taking the effective continuous increasing sequences and the effective continuous decreasing sequences as coal cutting cycle sequences specifically includes:

select to satisfy

① finding a sequence of successive increments/decrements of the shearer's position change using a stepwise discriminant method, using { a }_nRepresents it.

② read the increment/decrement subsequence a_nIn a₁And a_nCorresponding start time, using t₁And t_nRepresents;

③ for all increasing/decreasing subsequence a_nFind a sequence that satisfies the following conditions:

wherein A, B, C and D are constants.

According to the quantity of the hydraulic supports on the working face and the position data quality of the coal mining machine, the position change A in unit time is 20-50/h, the position change B in unit time is 50-100/h, the support number difference C is 90-130, and the collected effective support number D is 30-50.

④ regarding the sequence meeting the conditions in step ③ as a complete coal cutting cycle, counting the number of cycles (i.e., coal cutting knives) as M, and calculating the cumulative footage Acc + M0.865M/knife to calculate the position of the coal cutter at the current time.

The searching of the continuous increasing sequence and the continuous decreasing sequence is continuous, namely after the first continuous increasing sequence is searched, the continuous decreasing sequence is searched, then the continuous increasing sequence is searched, and the process is circulated until all the coal mining machine displacement change data are searched once.

And then, taking the effective continuous increasing sequence and the effective continuous decreasing sequence as coal cutting circulating sequences, wherein the serial number of the coal cutting circulating sequences is the number of cutters for cutting coal, so that the first coal cutting circulating sequence corresponds to the displacement change data of the coal mining machine when the first cutter cuts the coal, and the c-th coal cutting circulating sequence corresponds to the displacement change data of the coal mining machine when the c-th cutter cuts the coal.

In one embodiment, the sequentially searching a plurality of continuous increasing sequences and continuous decreasing sequences in the displacement change data of the coal mining machine as the to-be-selected coal cutting cycle sequence specifically includes:

the following method is adopted to search the continuous increasing sequence:

the continuously decreasing sequence is searched in the following way:

Specifically, in the process of searching for the continuous increasing sequence, two adjacent positions are a_n-1<a′_nWhen a is going to_n' addition of { a_nA sequence is multiplied; when a is_n-1≥a_nWhen is, with a_n-1Position search backward for 10 stents if a exists_n-1<a_m', will a_m' addition of { a_nAnd with a_m' search backward for the search base point is continued.

The embodiment considers the triangular coal cutting situation, and avoids omission when searching continuous increasing or decreasing sequences.

In one embodiment, the maximum working resistance of the shearer passing through the hydraulic supports is calculated in each coal cutting cycle sequence to form a pressure matrix of the whole working surface, and the pressure matrix includes the maximum working resistance of each coal cutting cycle sequence at each hydraulic support, and specifically includes:

The present embodiment relates the coal cutting cycle sequence and the hydraulic support by a pressure matrix, thereby relating position to pressure.

In one embodiment, the calculating the pressure step of the whole working surface according to the pressure matrix specifically includes:

slicing the pressure matrix to obtain a plurality of sub-pressure matrixes;

Wherein

According to p_ijOf the neighbor matrix

Wherein N1 and N2 are preset constants;

Specifically, the coal face is divided into 5 areas in the inclined direction according to (1:2:4:2:1), namely: the I area, the II area, the III area, the IV area and the V area are pressed very little, the II area, the III area and the IV area are pressed frequently and have short intervals, the influence on the whole working face is large, the step pressing distances need to be calculated by areas respectively, and then the step pressing distances of the whole working face are calculated by a weighting method.

The step pitch is calculated, the technical scheme of calculating the step pitch is described by taking the area III as an example, and the calculation schemes of other areas are the same. The method mainly comprises the following steps:

① slicing the pressure matrix F to obtain the III-th area pressure matrix F', and determining the pressure values F_ijDifferent from the magnitude of the pressure threshold, F_ijDivided into two parts, i.e. when F_ijAt > 350bar, the label is p_ij＝1；F_ij< 350bar and is denoted p_ij0; and obtaining a coming pressure identification matrix, and recording as follows:

② analyzing the pressure identification matrix one by one to judge the pressure of the adjacent neighbors when p is_ijNeighbor matrix

In, p_i-1j-1+p_i-1j+p_i-1j+1+p_ij-1+p_ij+p_ij+1+p_i+1j-1+p_i+1j+p_i+1j+1When the value is more than or equal to 6, let

When p is_i-1j-1+p_i-1j+p_i-1j+1+p_ij-1+p_ij+p_ij+1+p_i+1j-1+p_i+1j+p_i+1j+1When less than 6, let

The resulting compressive strength matrix is recorded as:

③ calculating the pressure vector according to the pressure matrix, the future pressure matrix and the n-dimensional column vector

Multiplying to obtain the column vector of the incoming pressure, and recording as:

④ future pressure intensity column vector

Converting into a coming pressure intensity characteristic character string sequence through numerical splicing: str ═ x₁x₂...x_n", using the regular expression:

regEx ═ ([1-9] {3, } | [2-9] {2, }) (0{1,2} [1-9] {1, }) "match the character string str, can match out the pressure continuation segment, according to the cutting feed rate 0.865 m/knife conversion to obtain the pressure continuation distance, and add the distance from the end of the current pressure to the beginning of the next pressure, and then calculate the pressure step distance of the current time.

Respectively calculating 5 areas, namely a historical pace pressing list and an average pace pressing list of an area I, an area II, an area III, an area IV and an area V, and then calculating the pace pressing of the whole working surface by a weighting method.

Fig. 2 is a schematic diagram of a hardware structure of an electronic device for automatically measuring a step pressure from a fully mechanized mining face according to the present invention, which includes:

at least one processor 201; and the number of the first and second groups,

a memory 202 communicatively coupled to the at least one processor 201; wherein the content of the first and second substances,

the memory 202 stores instructions executable by the one processor to cause the at least one processor to:

The electronic device may further include: an input device 203 and a display device 204.

The processor 201, the memory 202, the input device 203 and the display device 204 may be connected by a bus or other means, and are illustrated as being connected by a bus.

The memory 202, as a non-volatile computer-readable storage medium, may be used to store a non-volatile software program, a non-volatile computer-executable program, and modules, such as program instructions/modules corresponding to the fully mechanized face pressure step pitch automatic measurement method in the embodiment of the present application, for example, the method flow shown in fig. 1. The processor 201 executes various functional applications and data processing by running nonvolatile software programs, instructions and modules stored in the memory 202, namely, the automatic measuring method of the stride from the fully mechanized face in the above embodiments is realized.

The memory 202 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the fully mechanized face push step automatic measurement method, and the like. Further, the memory 202 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 202 optionally includes memory remotely located from the processor 201, and these remote memories may be connected over a network to a device that performs the fully mechanized face to pace the automatic measurement method. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 203 may receive input user clicks and generate signal inputs related to user settings and functional control of the automatic measuring method of the fully mechanized face to pace. The display device 204 may include a display screen or the like.

The method of automatic measurement of fully mechanized face-to-seam cadence in any of the above method embodiments is performed when the one or more modules are stored in the memory 202 and executed by the one or more processors 201.

According to the fully-mechanized mining face pressure step pitch automatic calculation method based on the position of the coal machine and the mine pressure change characteristics, manual participation is not needed, the coal cutting behavior can be automatically identified, the maximum working resistance is acquired, the pressure step pitch is calculated through automatic data acquisition and automatic program operation by a computer, the mine pressure data analysis efficiency and the analysis accuracy are higher, and the production cost of coal mine enterprises is greatly reduced.

select to satisfy

the following method is adopted to search the continuous increasing sequence:

the continuously decreasing sequence is searched in the following way:

bracket number a for sequentially comparing displacement time sequence change data of two adjacent coal mining machines_n-1' and a_n', if the previous shearerBracket number a of displacement time sequence change data_n-1'>Bracket number a of current coal mining machine displacement time sequence change data_nAdding the displacement time sequence change data of the current coal mining machine into the continuous decreasing sequence;

slicing the pressure matrix to obtain a plurality of sub-pressure matrixes;

Wherein

According to p_ijOf the neighbor matrix

Wherein N1 and N2 are preset constants;

As the best embodiment of the invention, the method for automatically calculating the pressure step pitch of the fully mechanized mining face based on the position of a coal machine and the mine pressure change characteristics comprises the following steps:

firstly, analyzing a coal cutting curve of a coal cutter, removing invalid data, establishing an analysis model for identifying the number of effective coal cutting knives counted by a coal cutting row, and accumulating the footage of a working face according to 0.8-0.865 m/knife so as to obtain the corresponding relation between the working face time and the footage. And secondly, periodically acquiring the maximum working resistance of each hydraulic support in the coal mining stage, and determining the maximum working resistance as a pressure value under the current footage. Then, dividing the pressure value, considering that the top plate is pressed and correspondingly marked when the pressure value is higher than 350bar, establishing a working surface pressing step statistical analysis model according to the distribution characteristics of the marked points, judging that the pressure is pressed when the pressure characteristic value of the adjacent area reaches a set condition, and calculating the present pressing continuation distance and the pressing step distance when the next pressing is carried out.

Therefore, the coal machine position and the mine pressure change characteristics are analyzed, effective data are collected, a data analysis model is established, and the pressure step pitch of the fully mechanized coal face can be automatically calculated. The specific implementation mode is as follows:

collecting and storing data in a centralized manner, selecting 1#, 4#, 7#, … … 133#, 136#, … …, (3 × N-2) bracket right pressure and coal cutter position as research objects in a working face, collecting data every 30s, and using an SQL Server database as a main storage platform for system management and real-time data; as shown in fig. 3, the safe mine pressure is classified into a category when the pressure is lower than 250bar, each 50bar is added, and each color is assigned, and the darker the color represents that the pressure of the top plate is larger, which is beneficial to visualization. 350bar is used as a pressure threshold value, and the pressure of the top plate is considered to be used for calculating the pressure step distance when the pressure is higher than 350 bar; the coal face is divided into 5 areas according to (1:2:4:2:1) in the inclined direction, namely: the I area, the II area, the III area, the IV area and the V area are pressed very little, the II area, the III area and the IV area are pressed frequently and have short intervals, the influence on the whole working face is large, the step pressing distances need to be calculated by areas respectively, and then the step pressing distances of the whole working face are calculated by a weighting method.

(2) ① finding the maximum increasing/decreasing subsequence of the position change of the coal mining machine by using a step-by-step discrimination method and using { a }_nRepresents it. In the process of searching the maximum increasing sequence, two adjacent positions are a_n-1<a_nWhen it is, a_n' addition of { a_nA sequence is multiplied; when a is_n-1≥a_nWhen is, with a_n-1Position search backward 10 stands (considering the triangular coal cutting situation), if a exists_n-1<a′_mA is to_m' addition of { a_nAnd with a_m' continue backward search for search base point, ② read increment/decrement subsequence a_nIn a₁And a_nCorresponding start time, using t₁And t_nRepresentation ③ for all increasing/decreasing subsequence a_nFind a sequence that satisfies the following conditions:

the method comprises the steps of acquiring a working face hydraulic support, acquiring an effective support number D of 30-50 according to the quantity of working face hydraulic supports and the quality of coal mining machine position data, wherein A, B, C and D are constants, the position change A in unit time is 20-50/h, B is 50-100/h, the support number difference C is 90-130, and ④ considers that a sequence meeting the conditions in step ③ is a complete coal cutting cycle, the statistical cycle number (namely the number of coal cutting knives) is M, and the accumulated footage Acc is Acc + M0.865M/knife, so that the position of a coal mining machine at the current time can be calculated.

One-to-one correspondence of accumulated footage to time may be achieved by calculation, as shown in FIG. 4:

(3) and acquiring the maximum cycle end resistance of the hydraulic support, wherein the pressure of a top plate acting on the support is gradually increased from a stable state after initial supporting force in the process of cutting coal by the coal mining machine through the hydraulic support until the coal mining machine leaves the support and is pushed forwards, and the maximum supporting force of the support when the support bears the pressure of the top plate in the process is called as the working resistance of the support. Using formula F during each coal cutting cycle_max＝max{F(t,t_{Coal machine entry}＜t＜t_{Coal mill exit}) Calculating the maximum working resistance of the coal mining machine when the coal mining machine passes through the hydraulic support, and finally forming a pressure matrix which is recorded as:

wherein n is the number of coal cutting knives and m is the number of supports.

(4) Calculating the pressure step pitch, namely calculating the pressure step pitch of an I area, a II area, a III area, an IV area and a V area respectively, and mainly comprising the following steps of:

The resulting compressive strength matrix is recorded as:

④ future pressure intensity column vector

regEx ═ ("1-9 ] {3, } | [2-9] {2, }) (0{1,2} [1-9] {1, })" match the character string str, can match out the pressing continuation segments, each pressing continuation segment is a numerical value, which represents the number of coal cutters, and therefore, the pressing continuation distance is obtained by the cutter feed rate 0.865 m/cutter conversion. The number of bits of the non-press continuous segment between the current press continuous segment and the next press continuous segment is the number of coal cutting knives from the end of the current press to the start of the next press, so that the distance from the end of the current press to the start of the next press is obtained by the conversion of the cutting footage of 0.865 m/knife. Adding the continuous distance of the coming pressure to the step distance of the coming pressure, and further calculating the step distance of the coming pressure.

The sequence, the pressure coming time, the working face pushing progress, the pressure coming duration, the pressure coming step pitch and the like of each pressure coming of the I, II.

TABLE 1 near 14 times pressure in the III zone (No. 40-85 bracket) of the working surface

(5) Zone I press 1 time, first press position 14.705 m; pressing for 70 times in the II area, and averaging the pressing steps of 18.795 m; zone III press 119 times, average press step 16.857 m; pressing 114 times in the IV area, and averaging the pressing step pitch to 16.61 m; the V-th area is pressed for 23 times, the step size is 20.76m on average, and a historical step size statistical analysis chart shown in figure 5 is generated. The weighted average pressure step pitch of the fully mechanized mining face is 16.97 m.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An automatic measuring method for the pressure step of a fully mechanized mining face is characterized by comprising the following steps:

2. The method for automatically measuring the pressure step from the fully mechanized mining face according to claim 1, wherein the method for finding out a plurality of continuous increasing sequences and continuous decreasing sequences from the displacement variation data of the coal mining machine, and taking the effective continuous increasing sequences and the effective continuous decreasing sequences as coal cutting cycle sequences specifically comprises:

select to satisfy

3. The method for automatically measuring the pressure step pitch of the fully mechanized mining face according to claim 2, wherein the sequentially searching a plurality of continuously increasing sequences and continuously decreasing sequences in the displacement change data of the coal mining machine as a coal cutting cycle sequence to be selected specifically comprises:

the following method is adopted to search the continuous increasing sequence:

when a is_n-1≥a_nWhen the time sequence change data of K1 coal mining machines are searched backwards, if a exists_n-1<Support number a of displacement time sequence change data of mth coal mining machine_mAdding the displacement time sequence change data of the mth coal mining machine into the continuous increasing sequence, continuously searching backwards by taking the displacement time sequence change data of the mth coal mining machine as a searching base point, and otherwise, ending the searching, wherein K1 is a preset constant;

the continuously decreasing sequence is searched in the following way:

4. The method for automatically measuring the pressure step from the fully mechanized mining face according to claim 1, wherein the maximum working resistance of the coal mining machine passing through the hydraulic supports is calculated in each coal cutting cycle sequence to form a pressure matrix of the whole working face, and the pressure matrix comprises the maximum working resistance of each coal cutting cycle sequence at each hydraulic support, and specifically comprises the following steps:

5. The method for automatically measuring the pressure step of the fully mechanized mining face according to claim 4, wherein the step of the pressure step of the whole working face is calculated according to the pressure matrix, and specifically comprises the following steps:

slicing the pressure matrix to obtain a plurality of sub-pressure matrixes;

Wherein

According to p_ijOf the neighbor matrix

Wherein N1 and N2 are preset constants;

6. An electronic device for automatically measuring the pressure step pitch of a fully mechanized mining face based on the position and the mine pressure change characteristics of a coal machine is characterized by comprising:

at least one processor; and the number of the first and second groups,

7. The electronic device for automatically measuring the coal mining face pressure step distance based on the coal mining machine position and the mine pressure change characteristic as claimed in claim 6, wherein the step of finding out a plurality of continuous increasing sequences and continuous decreasing sequences from the displacement change data of the coal mining machine, and taking the effective continuous increasing sequences and continuous decreasing sequences as coal cutting cycle sequences specifically comprises:

select to satisfy

8. The electronic device for automatically measuring the coal mining face coal-to-seam distance based on the coal mining machine position and the mine pressure change characteristic as claimed in claim 7, wherein the step of sequentially searching a plurality of continuous increasing sequences and continuous decreasing sequences in the displacement change data of the coal mining machine as the coal cutting cycle sequence to be selected specifically comprises:

the following method is adopted to search the continuous increasing sequence:

when a is_n-1≥a_nWhen the time sequence change data of K1 coal mining machines are searched backwards, if a exists_n-1<Displacement time sequence change number of m-th coal mining machineAccording to the bracket number a_mAdding the displacement time sequence change data of the mth coal mining machine into the continuous increasing sequence, continuously searching backwards by taking the displacement time sequence change data of the mth coal mining machine as a searching base point, and otherwise, ending the searching, wherein K1 is a preset constant;

the continuously decreasing sequence is searched in the following way:

9. The electronic device for automatically measuring the coal mining face pressure step distance based on the coal mining machine position and the mine pressure change characteristics as claimed in claim 6, wherein the maximum working resistance of the coal mining machine passing through the hydraulic support is calculated in each coal cutting cycle sequence to form a pressure matrix of the whole working face, the pressure matrix comprises the maximum working resistance of each coal cutting cycle sequence at each hydraulic support, and the electronic device specifically comprises:

10. The electronic device for automatically measuring the pressure step of the fully mechanized mining face based on the position of the coal mining machine and the variation characteristic of the mine pressure according to claim 9, wherein the step of calculating the pressure step of the whole working face according to the pressure matrix specifically comprises:

slicing the pressure matrix to obtain a plurality of sub-pressure matrixes;

Wherein

According to p_ijOf the neighbor matrix

Wherein N1 and N2 are preset constants;